Blade of the Immortal (無限の住人, Mugen no Jūnin, lit. "the inhabitant of infinity") is an anime series based on the manga series created by Hiroaki Samura. The series is set in Japan during the mid-Tokugawa Shogunate period and follows the cursed samurai Manji, who has to kill 1000 evil men in order to regain his mortality.

The anime is produced by Bee Train and directed by Kōichi Mashimo with production support by Production I.G and Pony Canyon. Bee Train was responsible for the animation production, Pony Canyon produced the music for the series, and Yoshimitsu Yamashita designed the characters. In North America, Media Blasters licensed the series and released it on September 29, 2009.

The opening theme is "Akai Usagi" (赤いウサギ, lit. "red rabbit") by Makura no Sōshi, while the closing theme is "Wants" by GRAPEVINE. "Akai Usagi" was included on the CD album "Mugen no Jūnin Original Soundtrack", released on July 16, 2008, and "Wants" was released on a CD single on May 21, 2009.

Episode 01 (This episode)

Manji is a skilled samurai who has a decisive advantage; no wound can kill him. In the past, his actions led to the death of 100 other samurai. Cursed with immortality at the hand of an 800-year-old nun named Yaobikuni, he is compelled by the death of his sister to make amends by killing 1000 evil men, and until he does Manji will be kept alive by “sacred bloodworms" remarkable creatures that allow him to survive

nearly any injury and reattach severed limbs even after hours of separation.